Art of treating tubes interiorly with liquid coating agents.



E. T. GREENFIELD.

ART oF TREATTNG TUBES vINTERIORLT WITH LlQUlD coATlNG AGENTS.

AAPPLICATION FILED JAN. A23. 1912. vRENIWED DEC. 15,1914. 1&469791 Patented July 20, 1915.

3 SHEETS-SHEET 1.

E. T. GREENFIELD. y ART oF TREATTNG TUBES TNTERl'oRLY WITH Lloum coATTNG AGENTS.

l APPLICATION FILED 11111.23. 1912. RENEWED DEC. 15,1914. 193.1457931. D

Patented July 20, 1915.

3 SHEETS-SHEET 2.

E. T. GREENFIELD. ART oT TREATING TUBES INTERIORLY WITH LIQUID coATIN'G AGENTS.

APPLICATION FILED 1AN.23, 1912. RENEWED DEC. 15,1914.

Patented .Tiny 2o, 1915.

IMWQL 3 SHEETS-SHEET 3.

' i an sraaas raaaiar onirica ART 0F TREATING- TUBES INTERIORLY LIQUID COATING- AGENTS.

Specification of Letters Patent.

Patented July 20, 1915.

.Application-filed January 23, 1912, Serial No. 672,826. Renewed December 15, 1914. SeraLNo. 877,446.

To all 'whom it may concern.'

Be it known that I, EDWINT. GREENFIELD, a citizen of the'United States, and resident of Kiamesha, county of Sullivan, and State of New York, have made a new and useful Invention in the Art of Treating Tubes Interiorly with Liquid Coating Agents, of.

. feet a better interior coating than has heretofore been effected, by reason of the peculiar action of the apparatus. Third, to effect such coating with a minimum waste of material and with the best possible disposition of the same.

My invention will be fully understood by referring to the accompanying drawings, in

which,

Figures 1 and 2, when placed end to end Iwith Fig. 1 on the left, are longitudinal sectional views of the entire apparatus, part of the mechanism being shown in side elevation. Fig. 3 is an enlarged sectional View taken on the broken line X-X Fig. 1, and as seen looking thereat from right to left in the direction of the arrows.

Referring now to the drawings in detail, 1 1 represent the oor of the room where the apparatus is to be used and 2, 2, are legs supporting the frame 3 of the machine.

4, 4, are groovedguide-ways for sustaining the tube to be treated, said guide-ways belng supported and secured directly by the frame.

5 represents a tube in position as it is being treated.

6 representsy a bracket secured by bolts to the legs 2, its function being to support the liquid treating material, preferably black shellac in solution with alcohol, in a tank or chamber 7 provided with a cover. and a partition near one end to prevent evaporation, said partition being open at the bottom.

8 represents an air pipe running in the direction/of the arrows from a source of compressed airand secured directly tothe frame 3.

9 represents a cock for cutting olf the air supply and 10 an additional cock located near the operator for effecting the operation in each pipe, there being one of these cocks 10 in each of the branch air pipes and only one cock 9 which regulates the entire air supply. The pipe 8 is connected at its left hand end to a number of smaller pipes 11. y

12 are additional pipes running therefrom 60 anu from the same source of air supply to -air tight cylinders, and 13 are vertically movable pipes extending from the bottoms of said air tight cylinders to liquid carr ing cups 14 which are supported by side ro s 15 65 15 and are connected at their tops to a piston rod 16, all of these parts being supported or sustained by a bracket 17 on an upright 24 of the frame.

18 are cylinders and 19 are supports or 70 standards (see Fig. 1) for air chambers 21.

20 are pistons located in the cylinders 18 and designed to lift the cups 14 so as to place the ends of the pipes 13 in the coating liquid, as will be described later on.

22 are air pipes running from the air chambers 21, each of their free ends being provided with a screw-threaded connector 23 of the desired diameter to attac'h thereto the screw-threaded end of the tube 5 80 which is to be treated.

26 is an adjustable stop for the upper ends of the piston rod 16 and is connected to the upright 24 by an adjustable bolt 27 having play or movement in an oblong slot 28.

29 (see Fig. 2) is a vessel forreceiving the surplus coating material after it is blown through the tube which is being treated, said vessel being sustained upon the floor 1 by four legs 30, 30. I 90 31 is the mouth of the Vessel 29.

32 is the coverof the vessel and 33 represents a portable vessel for receiving the coating material when it is withdrawn from the vessel 29. i

34 is an outlet pipe, v35 being a cock adapted to release the material and allow it to run into the portable vessel 33.

I have shown in Figs. 1 and 2 of the drawings an apparatus for treating two tubes 100 at the same time; of course, it will be understood that any number of tubes may be treated this way by merely duplicating thef. l parts.

vrection of the arrows.

cures the tube 5 to be treated to the screwto the lower end of the cylinder 18 beneath4 the piston 20, thereby causing it-the piston-to be raised and-hence imparting upwardymotion to the piston rod 16 and the .two side rods 15 which carry the cup 14.

When these side rods assume the extreme vupper llimit they come in contact with the adjustable stop 26, but before this has been accomplished the pipe 13 enters the cup 14 a definite distance, dependent upon the adjustment of the stop 26 and permits the coating material .to be subjected to the vacuum produced in the pipe 13 by the inflow of air through the pipe 22 and the tube 5 which is being treated. This continues until the desired amount of coating material, dependent upon the depth of the pipe 13 in the cup 14 and the adjustment of the stop 26, has been exhausted. The attendant sees when this occurs bv observing the open end of the tube 5, noticing when the discharge of vapor v discontinues. He immediately closes the cock 10 when the machine ceases operation and the cup 14 again descends to its lowest point in the vessel, as'shown in Fig. 1. .The tube 5 which has beenully treated is then disconnected from the connector 23 and theapparatus is ready for treatmentof another tube. In the same manner an attendant may attend to the treatment of two tubes upon a parallel pipe 22 as seen on the right in Fig. 3, the opertion of these pistons 20 for the cylinders 18 being exactly alike in their action; ln'

, this way one attendant may readily attend to thetreatment of 'two tubes at one time and the apparatus eiiect the coating of `the interior of the tubes with a liquid bath 1 to the desired extent, dependentupon the .j adjustment of the machine.

It will beinoted that the compressed air acting upon the interior of the tube,` after having supplied the' necessary amount of 1 am enabled to treat tubes of variable size.

Variations in the eect of the coating may also be produced by varying the pressure at vthe source of air supply, in accordance with the pressure it is desired to exert, so that Same Y an air pressure gage will give to the attend- I do not limit myself to the specialstructural arrangement shown, as it is obvious that my novel method of treatment may be eected by various kinds of apparatus.

I believe it is broadly new with me; to coat the interior surface of the tubes with a liquid paint by compressed air and to apply it in such manner that only' the necessary amount for producing the desired result is required, and this I accomplish `by a variation of the supply in the manner described and also by varying the pressure of the air acting to distribute this coating material -in the manner described.

Having thus described my invention what l claim and desire to secure by Letters Patent of the United States is 1. The herein described method of treating a tube interiorly with a liquid coating agent, which consists in directing by a suitable blasefa spray ofthe liquid agent axially through a tube, and directing then, the same blast axially Vthrough the tubel to spread such sprayed liquid agent on the interior of the latter and remove any excess.

2. The herein described' method of treating a tube interiorly with a liquid coating agent, which consists in spraying by a suitable blast-an excess of the liquid agent axially' through a tube, and directing then, the same blast axially through the tube to spread such sprayed liquid agent on the interior of the latter and remove the said excess.

3. rlhev herein described method of treating a tube interiorly with a liquid coating agent, which consists in spraying by a suitable blast an excess Aof the liquid agent axi-l ally through la tube, directing then, the

same blast axially through the tube to spread such sprayed liquid agent on the interior of the tube and remove the surplus and discharging the surplus liquid agentv from the latter.

4. The herein described method of treating a tube interiorly'with a liquid coating agent, which. consists in supporting a tube with one end open to thej atmosphere, spra j ing by a suitable blast an excess of the liquld agent axially through the tube, and directing then, the same blast axially through the tube to spread such sprayed liquid agent on the interior of the tube and blow ofi' any excess and discharging the surplus liquid agent from the open end of the latter.

5. The herein described method of 'treating atube interiorly with 'a liquid coating Maasai agent, which consists in subjecting a predetermined supply of the liquid agent to the injector action of a suitable blast for vaporizing such liquid agent and entraining the vapor in such blast, directing such blast and entrained vapor axially through a tube, and directing then, the same blast axially through the tube to spread such liquid agent on the interior of the latter.

6. A machine for coating tubes interiorlyv With a liquid coating agent, embracing an atomizing device for spraying a liquid agent axially through a tube, a receptacle shiftable relative to said atomizing device for supplying a liquid agent to the latter, means for automatically shifting said receptacle to operative position, and adjustable means for regulating the shifted position of said receptacle.

7. A machine for coating tubes interiorly with a liquid coating agent, embracing an atomizing device for spraying a liquid agent v aXially through a tube, a receptacle shiftable relative to said atomizing device for supplying a liquid agent t0 the latter, means for supplying compressed air to said atomizing device, and pneumatic means actuated by such compressed air supply for automatically shifting said receptacle to operative position.

8. The herein described method of treating an open-ended tube with' a liquid coating agent, which consists in fitting tight into one end of said tube, a blast nozzle, While supporting the tube, With its other end open,

liquid coating in quantity adapted to each tube, directing the blast and coating length- "wise of the tube, until the coating charge is used up, and continuing the blast to remove any surplus.

10M/.fx machine for coating the insides of open-ended tubes, consisting of a spraying device adapted to be fitted to the end of a tube and discharging along the aXis of said tube, means for supplying charges of liquid coating to the spray, said supply means, being arranged to be controlled by the spray blast, to supply a quantity adapted to each tu e.

ln testimony whereof I have signed ymy name to this specification in the presence of two subscribing Witnesses.

EDWIN T. GREENFELD.

Witnesses:

C. J. KINTNER, M. F. KEATING. 

